package com.Glow.reggie.filter;

import com.Glow.reggie.common.BaseContext;
import com.Glow.reggie.common.R;
import com.alibaba.fastjson.JSON;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @Author Glow
 * @Date 2022-07-27 22:57:34
 * @Description 检查用户是否登录
 * @Version 1.0
 */
@WebFilter(filterName = "LoginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配器,支持通配符
    public static AntPathMatcher PATH_MATCHER = new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request =  (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse)servletResponse;
        log.info("拦截到请求：{}"+request.getRequestURI());
        //拦截步骤
        //1、获取本次请求的URI
        String requestURI = request.getRequestURI();
        //2、判断本次请求是否要处理，否则放行
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login",
                "/doc.html",
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs"
        };
        boolean check = check(urls,requestURI);
        if(check)
        {
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }
        //判断登录状态，如果有session则直接放行
        if(request.getSession().getAttribute("employee")!= null)
        {
            log.info("用户已登录，用户ID为：{}",request.getSession().getAttribute("employee"));
           Long empId =(Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);
            filterChain.doFilter(request,response);
            return;
        }
        //判断客户端状态，如果客户已登录则直接放行
        if(request.getSession().getAttribute("user")!=null)
        {
            log.info("顾客已登录，用户ID为：{}",request.getSession().getAttribute("user"));
            Long CusId =(Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(CusId);
            filterChain.doFilter(request,response);
            return;
        }
        //如果未登录则返回未登录结果，通过输出流的方式向客户端页面响应数据，间request.js
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        log.info("用户未登录");
        return;


    }

    /**
     * 路径匹配，检查该路径是否可放行
     * @param RequestURI
     * @return
     */
    public boolean check(String[]urls,String RequestURI)
    {
            for(String url:urls)
            {
                boolean matcher = PATH_MATCHER.match(url,RequestURI);
                if(matcher)
                {
                    return true;
                }
            }
        return false;
    }
}
